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Applied Polymer Composites

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Title: PALSULE EQUATION FOR TENSILE MODULUS OF SHORT FIBRE REINFORCED POLYMER COMPOSITES AND ITS VALIDATION
Page Range: p.1-8
Author(s): Sanjay Palsule
File size: 139K
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 1
Issue No: No.1

Abstract
Palsule equation for tensile Modulus of short fibre reinforced polymer composites has been derived as the first equation that accounts for the aspect ratio of reinforcer as follows: Ec=1/8(EmVm+EfVf)+1/4 [(Ef+lambdaEm)+lambdaVf(Ef-EEm) divided by (Ef+lambdaEm)-psiVf(Ef-Em)]Em. Palsule equation has been validated by a comparison of the modulus of several short fibre reinforced polymer composites predicted by Palsule equation with their literature reported experimentally measured modulus values indicating that values predicted by Palsule equation are comparable with literature reported experimentally measured tensile modulus. 14 Refs.

Title: STUDIES OF THERMOPLASTIC POLYURETHANE ADHESIVES WITH CARBON NANOTUBES OBTAINED BY TWO DIFFERENT ROUTES AND THEIR INTERACTION MECHANISMS
Page Range: p.9-26
Author(s): Orgiles-Calpena E; Aran-Ais F; Torro-Palau A M; Orgiles-Barcelo C
File size: 255K
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 1
Issue No: No.1

Abstract
Carbon nanotubes (CNTs) combine excellent mechanical properties, high electrical and thermal conductivity, etc., and therefore have created a great interest in materials science and many industrial applications. The incorporation of carbon nanotubes to adhesives offers promising scientific potential to develop nanocomposites with improved properties and new functionalities. However, the addition of these nanofillers is challenging because of their tendency to the form aggregates and sedimentation. Consequently, it is necessary to insert functional groups on the surface of the nanotubes to promote and optimise their interaction with the polymer matrix. In this work, carbon nanotubes have been functionalised by an acid treatment and subsequently incorporated in a thermoplastic polyurethane adhesive (TPU) by two different methods: i) during polyurethane synthesis by in situ polymerisation; ii) external incorporation by dispersing nanotubes within the adhesive. The influence on the rheological, thermal and adhesive properties has been reported, and the analysis of the complex interactions of carbon nanotube-polyurethane has been discussed. 18 Refs.

Title: NANOCOMPOSITES WITH INCREASED CONTENT OF BETA- PHASE BASED ON POLY(VINYLIDENE FLUORIDE-CO-HEXAFLUOROPROPYLENE) AND ORGANICALLY MODIFIED NANOCLAY
Page Range: p.27-46
Author(s): Atanas Atanassov; Lyudmila Borisova; Dimitrina Kiryakova; Kostov G
File size: 216K
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 1
Issue No: No.1

Abstract
Polymer nanocomposites of Poly(vinylidene fluoride-co-hexafluoropropylene) with 15 mol% content of hexafluoropropylene containing up to 6.0 mass% organically modified montmorillonite nanoclay Cloisiteii15 A were prepared by melt-mixing at 200 degrees C. The initial copolymer was found to contain mainly the nonpolar m- phase. With the addition of Cloisite--15 A, the X-ray diffraction patterns showed basic peak at 2sshigher than 20 degrees together with smaller one at 222= 18 - 19 degrees which proved the formation of -- phase. At Cloisite--15 A content in the nanocomposites higher than 3.0 mass%, the X-ray patterns changed to singlepeak shape. The FT-IR analysis showed that the increase of nanoclay content results in increased d- phase content from 30% in the initial poly(vinylidene fluoride-co-hexafluoropropylene) to 86% in the materials containing 3.0 mass% CloisiteCC15 A. It was found that the temperatures of beginning, end and maximum of melting, as well as the crystallisation temperature, were higher than those of the initial copolymer. The tensile strength, elongation at break and energy of destruction of the composite materials containing Cloisiteaa15 A showed maximum at 0.5 - 0.75 mass% degree of filling and their values were 36.3 MPa, 1240 % and 18 J, respectively. 49 Refs.

Title: DIELECTRIC PROPERTIES OF POLYMETHYLMETHACRYLATE/BARIUM TITANATE (PMMA/BATIO3) NANOCOMPOSITES
Page Range: p.47-56
Author(s): Gupta S K; Pandey K N; Vishal Verma; Smita Mathur; Vijai Kumar
File size: 203K
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 1
Issue No: No.1

Abstract
Ceramics/polymer nanocomposites have a lower cost, excellent dielectric properties, good material strength and improved electrical and piezoelectric properties. Polymethylmethacrylate (PMMA) shows a rather low dielectric constant between 3 to 8 depending on its molecular weight and testing frequency. Barium titanate, (BaTiO3) has a very high dielectric constant of the order of ten thousand, because of which it has been extensively used for fabrication of multilayer capacitors. The dielectric and piezoelectric properties of the PMMA/ BaTiO3 nanocomposites films have been measured as a function of frequency and temperature. The piezoelectric responses have been evaluated with varying ceramic volume percentage. Morphological behaviour of nanocomposites have been performed with the aid of scanning electron microscopy (SEM). 18 Refs.

Title: NATURAL HARDWOOD FIBER REINFORCED CHEMICALLY FUNCTIONLIZED POLYETHYLENE COMPOSITES WITH IN-SITU FIBER/MATRIX INTERFACIAL ADHESION
Page Range: p.57-74
Author(s): Sanjay Palsule; Ogunsile B O; Priyanka; Anshu Anjali Singh
File size: 253K
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 1
Issue No: No.1

Abstract
Hardwood fibre (HWF) reinforced anhydride and acid functionalised maleic anhydride grafted high density polyethylene (CF-HDPE) composites have been processed by in-situ fibre / matrix interactions, without any use of compatibiliser and without any fibre treatment. The formation of composites is established by the increase in tensile modulus and tensile strength and the decrease in elongation at break with increasing amounts of the reinforcing HWF in HWF/ CF-HDPE composite compositions. The in-situ fibre/matrix interfacial adhesion in these composites has been established by scanning electron microscopy, and also by FTIR Spectroscopy. The measured tensile modulus of the composite with low volume fraction of hardwood fibre as reinforcer compares well with modulus predicted by Inverse rule of mixtures, Hirsch model, Halpin-Tsai equations, Nielsen model and Palsule equation. 31 Refs.

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